There are alot of articles about how to stay motivated with exercise and how not to get bored. One of my personal bits of advice (if you have access and can afford it) is to try pilaties. I enjoy the classic Joseph Pilaties method of study (vs. Windsor, or another style).

I have the blessing and the curse of being hyper-mobile. It's great to have flexibility, and it often makes exercises easier for me, but hyper-mobility can also make me more susceptible to injury or dislocation in joints. My point is that hyper-mobility can make things easier for me during pilaties class, but pilaties has a unique quality of being as much about the mental aspect as well as the physical (flexibility doesn't help that!). The intense focus and need for concentration makes it a constant challenge as well as a meditation time. If you stop focusing on the process, and the details, you miss out with pilaties. My teacher often reminds me not to bull through an exercise, just to get to the end location. Rather, control the different muscle groups in progression...to work the details. The results? A longer, stronger, leaner muscle...and alot of humility!